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Auto Expand selected option #26

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Auto Expand selected option #26

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f8252af
Introduce 'updateSelectionChain' function to detect all 'option' elem…
i350 Feb 22, 2021
8fd36ae
Tune example #2 to use 'Expand Selected Item Parents' feature
i350 Feb 22, 2021
32371d6
Fix problem of expanding non-leaf option if it is the selected value
i350 Feb 28, 2021
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4 changes: 2 additions & 2 deletions example/example.html
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Original file line number Diff line number Diff line change
Expand Up @@ -38,13 +38,13 @@ <h3>Example 2</h3>
<select id="sel_2" style="width:8em">
<option value="1" class="l1 non-leaf">opt_1</option>
<option value="11" data-pup="1" class="l2 non-leaf">opt_11</option>
<option value="111" data-pup="11" class="l3">opt_111</option>
<option value="111" data-pup="11" class="l3" selected="selected">opt_111</option>
<option value="12" data-pup="2" class="l2">opt_12</option>
<option value="2" class="l1">opt_2</option>
<option value="3" class="l1">opt_3</option>
</select>
<script>
$("#sel_2").select2ToTree();
$("#sel_2").select2ToTree({expandSelectedItemParents:true});
</script>

<br>
Expand Down
25 changes: 25 additions & 0 deletions src/select2totree.js
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Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,10 @@
buildSelect(opts.treeData, this);
}

if (opts.expandSelectedItemParents) {
var selectionChain=updateSelectionChain(this);
}

opts._templateResult = opts.templateResult;
opts.templateResult = function (data, container) {
var label = data.text;
Expand All @@ -24,6 +28,12 @@
if (ele.getAttribute("data-pup")) {
container.setAttribute("data-pup", ele.getAttribute("data-pup"));
}
if (opts.expandSelectedItemParents && (selectionChain.indexOf(ele.value)>-1)) {
$(container).addClass("showme");
if ($(container).hasClass("non-leaf") && selectionChain.indexOf(ele.value)!==0) {
$(container).addClass("opened");
}
}
if ($(container).hasClass("non-leaf")) {
return $.merge($('<span class="expand-collapse" onmouseup="expColMouseupHandler(event);"></span>'), $iteme);
}
Expand All @@ -48,6 +58,10 @@
$allsch.off("input", inputHandler);
$allsch.on("input", inputHandler);
});

s2inst.on("select2:select", function (evt) {
selectionChain=updateSelectionChain(this);
});

/* Show search result options even if they are collapsed */
function inputHandler(evt) {
Expand Down Expand Up @@ -161,4 +175,15 @@
showHideSub(this);
});
}
function updateSelectionChain(sl2) {

var values=[];
var currElm=$(sl2).find('option[value='+$(sl2).val()+']');
do
{
values.push(currElm.val());
}
while((currElm=$(sl2).find('option[value='+currElm.data('pup')+']')).length);
return values;
}
})(jQuery);